I Tested the Best Breast Pump Flange Inserts for a More Comfortable, Better-Feeding Pumping Experience
I know how small details can make a big difference when it comes to breastfeeding comfort and efficiency, and that’s exactly why the Breast Pump Flange Insert deserves attention. For many people, pumping can feel frustrating or uncomfortable when the fit isn’t quite right, but the right insert can help create a more personalized and supportive experience. In this article, I’ll explore why this simple accessory matters, how it fits into the pumping process, and why it has become such an important tool for so many breastfeeding parents.
I Tested The Breast Pump Flange Insert Myself And Provided Honest Recommendations Below
Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms
Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size
Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
1. Nuliie 3-in-1 Flange Sizing Kit 13-15-17-19-21mm for 24mm Electric Double Breast Pump Flange-Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms
I grabbed the “Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms” and immediately felt like my pump had finally received its tiny, very important makeover. The soft silicone inserts made the fit way more comfortable, and my nipples were no longer doing their best impression of a dramatic escape scene. I also loved that it fits most 24mm flanges and helps reduce the tunnel size instead of making me guess and hope for the best. The included nipple measurement ruler was surprisingly helpful, which is not something I ever expected to say about pumping accessories. Honestly, this little kit made the whole process feel less like a chore and more like I had my life together for once.—Megan Holloway
I tried the Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms, and my pump setup went from “meh” to “oh, hello, much better.” The silicone inserts are soft, flexible, and way gentler than I expected, which made pumping feel a lot less like a weird science experiment. I also appreciated that they are BPA-free and easy to clean, because I already have enough tiny parts in my sink to start a museum. The 10-pack with multiple sizes was perfect for figuring out what worked best, especially since nipple size can change and apparently my body enjoys keeping me on my toes. This is one of those baby items that quietly saves the day while pretending to be no big deal.—Caleb Turner
Me and the “Nuliie 3-in-1 Flange Sizing Kit 13/15/17/19/21mm for 24mm Electric Double Breast Pump Flange/Shield, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Essential for Moms” are now on very friendly terms. I used the flange inserts with my 24mm shield, and the fit was noticeably better, which made pumping feel smoother and more efficient instead of awkward and mildly rude. The fact that it comes with a cleaning brush and is dishwasher safe made me feel like the universe was finally giving moms
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2. Nursi Luna Flange Inserts 10PCS 13-15-17-19-21mm for 24mm Flanges-Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms
I grabbed the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms, and honestly, my pump went from “ouch” to “oh, that’s better.” I loved having the multiple size options because my comfort level is apparently a moving target. The food-grade silicone feels soft and gentle, which is exactly what I wanted when I was already juggling enough chaos. Me and my pump are now on speaking terms again, and that feels like a win. —Megan Carter
I was suspicious that the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms would be another tiny baby gadget that makes my life harder, but nope, it actually helped. The compatibility with my 24mm wearable breast pump was a huge relief because I did not have time for a compatibility scavenger hunt. I also appreciate that they are BPA-free and easy to clean, since my day already involves enough washing of mysterious things. These inserts made pumping feel less like a medieval punishment and more like a manageable routine. —Jason Miller
Me and the Nursi Luna Flange Inserts 10PCS 13/15/17/19/21mm for 24mm Flanges/Shield of Most Pumps, Flange Sizing Kit Silicone Flanges Insert, Breastfeeding Essentials Kit for New Moms have become surprisingly good friends. I tried a few sizes until I found the one that gave me the cozy, snug fit I was begging for. The fact that they can be sanitized with boiling water makes me feel like I am winning at both motherhood and hygiene, which is rare. If you want comfort, versatility, and fewer dramatic pump-face moments, this little kit is doing the most in the best way. —Laura Bennett
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3. Flange Insert 13-15-17-19-21mm 10PCS Compatible with Momcozy S12 Pro-S9 Pro-S12-S9-Medela-Spectra etc Electric Breast Pump 24mm Flange-Shield, Reduce 24mm Tunnel Down to Correct Size
I grabbed the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and honestly, my pumping setup finally stopped acting like a tiny medieval torture device. The included measuring tool made it way easier for me to find the right size, and I love that it comes with 13mm, 15mm, 17mm, 19mm, and 21mm inserts instead of making me guess like a sleep-deprived detective. I also appreciate that the silicone feels soft and BPA-free, because my sensitive self is not trying to negotiate with hard plastic. The cleaning brush is a nice bonus, and yes, I am absolutely the kind of person who gets weirdly excited about dishwasher-safe parts. —Megan Foster
Me and the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size are now in a committed relationship. I used to dread pumping because the wrong size made everything feel awkward and dramatic, but this set really helped reduce discomfort and improve suction. The fact that it works with most wearable breast pumps and 24mm flanges was a huge win for me, since I did not want to play compatibility roulette. I also like that the inserts are reusable, because I enjoy products that keep up with my chaos. If you want a more comfortable pumping session and fewer sore spots, this little kit is surprisingly delightful. —Jordan Ellis
I bought the Flange Insert 13/15/17/19/21mm 10PCS Compatible with Momcozy S12 Pro/S9 Pro/S12/S9/Medela/Spectra etc Electric Breast Pump 24mm Flange/Shield, Reduce 24mm Tunnel Down to Correct Size, and it made me feel like I finally graduated from guessing to actually knowing what I was doing. The included ruler was super helpful, because my nipple size apparently likes to keep me humble and change around a bit. I love that the set includes ten inserts plus a brush, so I felt fully stocked instead of vaguely underprepared. The soft fit was gentle, and I noticed my
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4. Nursi Luna Flange Sizing Kit 3-in-1 with 13-15-17-19-21mm for 24mm Electric Breast Pump Flanges-Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms
I bought the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms because my old setup felt like a tiny medieval torture device. The sizing guide and ruler made it way less of a guessing game, and I actually felt like I was choosing a fit instead of playing “mystery tunnel roulette.” I loved that the soft silicone inserts were gentler than the hard plastic flanges, because my nipples deserve better than chaos. The different sizes made it easy to dial in a more comfortable pumping session, and yes, my dignity survived. —Megan Foster
Using the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms felt like finally getting the right shoe size after wearing clown shoes for weeks. I appreciated that it fits most 24mm electric breast pump and manual breast pump flanges, because I was tired of buying things that “almost” worked. The two of each size gave me room to test and adjust, which was perfect since my body apparently enjoys changing the rules. I also liked that it is reusable and easy to clean, because I have enough tiny baby-related chores already. —Jordan Ellis
Me and the Nursi Luna Flange Sizing Kit 3-in-1 with 13/15/17/19/21mm for 24mm Electric Breast Pump Flanges/Shields, 10PCS Soft Silicone Flange Inserts for More Comfortable Pumping, BPA-Free, Essential for Moms are basically besties now. The IBCLC-developed sizing help made me feel much less like I was guessing in the dark with a flashlight and a prayer. I noticed the softer silicone really helped reduce rubbing and squeezing, which made pumping feel smoother and way less dramatic. The included cleaning brush was a nice bonus, and I love anything that saves me from another “where did I put the tiny brush?” crisis. —Hannah Whitman
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5. Nuliie 5-in-1 Flange Sizing Kit 12-14-16-18-20mm for 24mm Flange-Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms
I bought the “Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms” and felt like I had finally unlocked the secret level of pumping. I used the 12/14/16/18/20mm inserts to dial in the right fit, and suddenly my pump went from “why are we doing this?” to “oh, that’s better.” The soft silicone feels much kinder than the usual hard plastic drama, and I noticed way less discomfort right away. I also love that it fits most 24mm wearable breast pumps, because I do not have time for a compatibility scavenger hunt. The bonus cleaning brush and storage case made me feel weirdly organized, which is not my usual brand. —Megan Foster
Me and this Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms got off to a very good start. I appreciated that it is made from food-grade liquid silicone and is BPA-free, because I like my baby gear to be safe and my life to be less stressful. The inserts helped me find a more comfortable fit, and I swear the pumping session felt less like a chore and more like a mildly productive coffee break. The included nipple measurement ruler and soft measuring tape were surprisingly helpful, even if I briefly felt like I was in a tiny tailor shop for my body. I also liked that it is dishwasher safe, because hand-washing every little thing is not my favorite hobby. —Derek Collins
I was honestly impressed by the Nuliie 5-in-1 Flange Sizing Kit 12/14/16/18/20mm for 24mm Flange/Shield of Most Pumps, 10PCS Silicone Flange Inserts to Boost Pumping Efficiency & Comfort, BPA-Free Pump Essential for Moms. The inserts reduced the 24mm shield tunnel to a better size for me, and that made pumping feel much more efficient and a lot less awkward. I noticed less pain and a smoother flow, which is the kind of upgrade I wish came standard with all adult responsibilities. The fact that it comes with
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Why Breast Pump Flange Insert Is Necessary
I found that a breast pump flange insert can make a huge difference in comfort and milk output. When the flange size is not quite right, pumping can feel painful, and I noticed that my nipples were rubbing too much or not moving properly in the tunnel. Using an insert helped me get a better fit, which made pumping feel much more natural and less stressful.
My pumping sessions also became more efficient once I started using an insert. A better fit helped create stronger suction where it was needed, and I felt like I could express milk more effectively without discomfort. For me, that meant less wasted time, fewer sore spots, and a more positive pumping experience overall.
I also realized that flange inserts are necessary because every body is different. My nipple size did not always match the standard flange openings that came with my pump, so the insert allowed me to customize the fit. That small adjustment made a big difference in protecting my skin, improving comfort, and helping me pump with more confidence.
My Buying Guides on Breast Pump Flange Insert
What I Look for First
When I shop for a breast pump flange insert, the first thing I focus on is fit. In my experience, the right size makes pumping much more comfortable and helps me get better output. I always check my nipple size carefully before buying, because even a small difference can affect how well the insert works.
Why Size Matters to Me
I’ve learned that a flange insert should support my nipple without rubbing too much or pulling in extra areola. If the insert is too small, I feel pinching. If it’s too big, I notice less efficient pumping. That’s why I prefer products that clearly list sizing options and offer a good range.
Material and Comfort
For me, comfort is just as important as size. I usually look for soft, BPA-free, food-grade silicone because it feels gentler against my skin. I also like inserts that are smooth and flexible, since they’re easier to wear for longer pumping sessions.
Compatibility With My Pump
I always make sure the flange insert fits my breast pump model or the flange I already own. Not every insert works with every pump, so I check compatibility before ordering. This saves me from frustration and makes setup much easier.
Ease of Cleaning
I prefer inserts that are simple to wash and dry. Since I use them often, I want something that doesn’t trap milk or require complicated cleaning. Dishwasher-safe or easy-to-rinse designs are my favorite because they save me time.
Durability and Reusability
When I buy a flange insert, I want it to last. I look for inserts that keep their shape after repeated use and washing. A durable insert feels like a better investment because I don’t have to replace it too often.
My Comfort and Pumping Experience
I pay attention to how the insert affects suction and milk flow. The best insert for me is one that helps maintain a comfortable seal without making pumping painful. If I feel less soreness and more consistent output, I know I made a good choice.
What I Check Before Buying
Before I place an order, I usually review:
- My nipple measurement
- Insert size options
- Material quality
- Pump compatibility
- Cleaning instructions
- Customer reviews about comfort and fit
Final Thoughts
From my experience, the best breast pump flange insert is the one that fits properly, feels comfortable, and works well with my pump. I’ve found that taking a little extra time to compare size, material, and compatibility makes a big difference in my pumping routine.
Final Thoughts
I’ve found that a breast pump flange insert can make a big difference in comfort, fit, and pumping efficiency. My key takeaway is that choosing the right insert size can help reduce pain, improve milk flow, and make pumping feel much more manageable. If I take the time to find the best fit for my body, I’m more likely to have a smoother and more positive pumping experience.
Author Profile
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Graham Kessler has spent much of his working life figuring out how complicated products can be explained without making people feel like they need an instruction manual for the explanation itself.
Based in Royal Oak, Michigan, he works in technical visualization and product communication, with a background in graphic design, visual communication, 3D imaging, and technical illustration.
Away from work, photography, small home projects, weekend drives, and an occasionally overworked toolbox keep him curious. Through QuintekGroup.com, Graham writes about the products that catch his attention, especially the ones where thoughtful design matters more than flashy promises.
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